TCS to 2 or 1, as you feel more confortable, don't recomend to turn it off, you being on controller.
Brake Bias 2 towards the rear end should make the car turn better.
Anything else, just like people already said, don't try too hard, in any car, when you go too hard, you loose time, but in the case of the Cayman it's amplified by the car characteristics, the car dynamics gives you the feel it can turn faster and you can brake later, but it hasn't the engine power neither the torque to compensate any overdo, so you loose a lot of time every time you go anything sideways or you overcook the brakes. Try to keep your speed, take early apex, don't go sideways, as it'll took you forever to regain speed.